Short answer questions: a) How would you define a system to determine the temper

Question

Short answer questions:
a) How would you define a system to determine the temperature rise created in a
lake when a portion of its water is used to cool a nearby nuclear power
station?


b) At what temperature are the Celsius and Fahrenheit scales the same numerical
value?



c) Complete the following:
The __________the temperature difference the, the higher is the rate of heat
transfer.


d) Describe the differences between gauge pressure, vacuum pressure, and
absolute pressure.



f) In your own words describe the 1st Law of Thermodynamics?




e) Show that 1Kg.m^2 /s^3 m^2 is equivalent to 1 unit of power per unit of surface area.

Explanation / Answer

a- Measure the temperature of the water flowing into the power plant, or into its holding pond, and then measure the temperature of the water leaving the holding pond. b- At what temperature are the Celsius and Fahrenheit scales the same? A: -40 -c The larger the temperature difference, the higher is the rate of heat transfer. -d 1. Absolute pressure is measured in relation to the vacuum, while gauge pressure is the difference between the absolute pressure and the atmospheric pressure. 2. Absolute pressure uses absolute zero as it’s zero point, while gauge pressure uses atmospheric pressure as it’s zero point. 3. Gauge pressure is commonly used, while absolute pressure is used for scientific experimentations and calculations. 4. To indicate gauge pressure, a ‘g’ is placed after the unit. Absolute pressure, on the other hand, uses the term ‘abs’. 5. Due to varying atmospheric pressure, gauge pressure measurement is not precise, while absolute pressure is always definite. 6. Absolute pressure is sometimes referred to as ‘total systems pressure’, while gauge pressure is sometimes called ‘overpressure’. f- The 1st Law of Thermodyamics simply states that energy can be neither created nor destroyed (conservation of energy). Thus power generation processes and energy sources actually involve conversion of energy from one form to another, rather than creation of energy from nothing e-

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